I have had this problem too. I never let AI control my armies (I always use one stack). However, I often get engaged by multiple stacks especially when I am beseiging cities. In the ensuing battle, whatever units start the battle on map behave normally, even combining together before assaulting my position. This is true for all units except phalanx units which attack erratically, and is a hardcoded AI problem with RTW 1.2. The enemy units that reinforce the starting units have no sense of direction and scatter everywhere aimlessly and often hug the red line facing away. I now never try using reinforcements myself, as I am totally frustrated with how they work in any version or mod. This particular reinforcement issue has only happened to me in EB 0.7.4. I play on h/m with Koinon Hellenon, Iberia, Makedon, and Romani. It seems that every time the enemy reinforces I get this behavior from the reinforcing units.
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